Abstract: For the movement of while-drilling reaming tool in the borehole,the kinetic analytical method based on the Lagrange equation was presented.In terms of the penalty rules of normal-direction contact restriction,the contact force between reamer wings and rock was calculated.Meanwhile,the movement process and dynamic response of reaming tool in the borehole were investigated by kinetic simulation.Results show that with the increase of eccentricity between reaming tool axes and well bore axes,or with the decrease of reamer wing number,the actual pervious radius of reamed borehole will reduce gradually,while the maximal contact force between reamer wing and borehole wall will increase simultaneously.The simulation results present practical and applicable proposition.Research results agree well with relevant experimental law,which explains the availability of proposed analytical method.Research results offer extensive guidance for the design and application of multi-winged oil well drilling devices.